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Diffusion-driven extreme Mg and Fe isotope fractionation in Panzhihua ilmenite: Implications for the origin of mafic intrusion

文献类型：期刊论文

作者Tian, Heng-Ci2,3; Zhang, Chi2,3; Teng, Fang-Zhen4; Long, Yi-Jie2,5; Li, Shu-Guang1; He, Yongsheng1; Ke, Shan1; Chen, Xin-Yang4; Yang, Wei2,3
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2020-06-01
卷号278页码:361-375
关键词Ilmenite Mg-Fe isotopes Chemical diffusion Panzhihua layered intrusion Interstitial liquid immiscibility
ISSN号0016-7037
DOI10.1016/j.gca.2019.10.004
英文摘要To investigate the petrogenesis of Fe-Ti oxide ore deposits, we report Mg and Fe isotopic compositions for coexisting olivine, clinopyroxene and ilmenite in Fe-Ti oxide ores, magnetite-bearing gabbros and gabbros from the Panzhihua Fe-Ti-oxide-bearing layered mafic intrusion, Southwest China. Olivine and clinopyroxene have delta Mg-26 values ranging from -0.47 to -0.32 parts per thousand and -0.40 to -0.18 parts per thousand, and delta Fe-57 values from -0.21 to +0.23 parts per thousand and -0.16 to +0.20 parts per thousand, respectively. Most of these mineral pairs display disequilibrium inter-mineral fractionation as they fall off the theoretically predicted equilibrium fractionation lines. Ilmenites from oxide ores and magnetite-bearing gabbros (Group 1) have mantle-like or lower delta Mg-26 values of -0.80 to -0.13 parts per thousand and delta Fe-57 values of -0.33 to -0.23 parts per thousand, and those from gabbros (Group 2) display slightly to extremely higher delta Mg-26 values of +0.48 to +23.10 parts per thousand and much lower delta Fe-57 values of -0.59 to -0.33 parts per thousand. The delta Mg-26 negatively correlates with delta Fe-57 in all ilmenites, which cannot be explained by simple extensive fractional crystallization or Soret diffusion. Instead, the negative correlations between delta Mg-26 and delta Fe-57 and between MgO and FeO in ilmenites result from Mg-Fe inter-diffusion among ilmenite, silicate minerals and high-Ti basaltic melts. The extremely large isotopic variations were produced by the large Mg activity gradient between different types of ilmenites and melts, which was enhanced by interstitial liquid immiscibility process. Our study therefore demonstrates that combined Mg-Fe isotopes can be used to trace the genesis of Fe-Ti-oxide-bearing ore. (C) 2019 Elsevier Ltd. All rights reserved.
WOS关键词LARGE IGNEOUS PROVINCE ; SW CHINA IMPLICATIONS ; BAIMA LAYERED INTRUSION ; MAGMA CHAMBER PROCESSES ; EMEISHAN FLOOD BASALTS ; SILICATE MELTS ; SKAERGAARD INTRUSION ; BUSHVELD COMPLEX ; TI OXIDES ; MAGNESIUM
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41730214] ; National Natural Science Foundation of China[41490633] ; National Natural Science Foundation of China[41729001] ; National Postdoctoral Program for Innovative Talents[BX201700237] ; China Scholarship Council[201804910290]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000536445700010
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/96700]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Tian, Heng-Ci; Yang, Wei
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Tian, Heng-Ci,Zhang, Chi,Teng, Fang-Zhen,et al. Diffusion-driven extreme Mg and Fe isotope fractionation in Panzhihua ilmenite: Implications for the origin of mafic intrusion[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,278:361-375.
APA Tian, Heng-Ci.,Zhang, Chi.,Teng, Fang-Zhen.,Long, Yi-Jie.,Li, Shu-Guang.,...&Yang, Wei.(2020).Diffusion-driven extreme Mg and Fe isotope fractionation in Panzhihua ilmenite: Implications for the origin of mafic intrusion.GEOCHIMICA ET COSMOCHIMICA ACTA,278,361-375.
MLA Tian, Heng-Ci,et al."Diffusion-driven extreme Mg and Fe isotope fractionation in Panzhihua ilmenite: Implications for the origin of mafic intrusion".GEOCHIMICA ET COSMOCHIMICA ACTA 278(2020):361-375.

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来源：地质与地球物理研究所

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